General Motors produced the Hummer H3T which served as the pickup version of the H3 SUV using molds from the GMT345 platform. With a 134.2-inch wheelbase the Hummer H3T exceeds the shorter wheelbase of 111.9 inches on the H3 SUV then expands to 212.7 inches in length and 74.7 inches in width to convey an authoritative road stance. Through standard equipment the Hummer H3T included a 3.7-liter inline-five engine generating 242 horsepower which customers could power with either a 5-speed manual or a 4-speed Hydra-Matic automatic transmission. H3T Alpha models powered by a 5.3-liter V8 engine achieved 300 horsepower yet needed 8.8 seconds to reach 60 mph from standstill. A front and rear locking differential system was offered separate from standard equipment through an optional Off-Road Adventure Package that improved traction in tough off-road conditions. The manufacturing of the Hummer H3T came to an end as General Motors discontinued the Hummer brand in May 2010. Users can attain reliable H3T parts for maintenance and repairs through GM-authorized suppliers because these suppliers conduct extensive testing and provide warranty coverage for their components.
Hummer H3T groups concerns into evaporative control, wheel end integrity, and throttle management. In evaporative control, the H3T can hard start after refueling with P0496. A stuck purge solenoid pulls vacuum on the tank during restart. Actuate the EVAP valve, verify vent flow, and look over the lines for kinks. Replace the purge solenoid if it leaks, then verify stable fuel trims. During steering inputs, the H3T can emit a growling noise that rises or falls in pitch. That symptom usually indicates a worn wheel hub assembly and excessive axial play. Confirm with a road weave, measure play, then install a new hub. Tighten the axle nut to the specified torque, then road test the H3T on a smooth surface. For throttle management, the Hummer H3T can enter reduced engine power mode. Sooted throttle body or wiring faults reduce throttle response and trigger messages. Clean or replace the throttle body, and verify the APP sensor and harness signals. Perform a throttle relearn, clear codes, and confirm a steady idle on the H3T. Document test values so the Hummer service record remains consistent and traceable. Across repairs, the Hummer H3T should restart cleanly and track straight after testing.
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